You are hubristic to pretend you can second guess what was in the minds of 52% of the population
Only 36% of the electorate voted for Brexit. Approx. 5% of the UK population, including over 3 million EU citizens, had no vote at all. Many British citizens living abroad, including in the EU, were denied a vote due to the 15-year rule.
Much more important is the increased power to shape and control our regulatory and business environment and free ourselves of EU rules on state aid and expand the patent box so fostering R and D. Freedom from EU state aid rules will also help to fulfil the goal of rejuvenating the poorer parts of Britain and level up the economy.
This is why we CANNOT have a level playing field. If we have this we will be snookered
One of the big successes is UK innovation, supported by grants and tax breaks for R&D. Unfortunately the UK government has not tied this to a requirement to manufacture in the UK, so there are companies that have taxpayer supported R&D campuses in the UK but make all of their products elsewhere. A certain company making expensive floor cleaners springs to mind as an example.
There are many other regulatory and other benefits to local industry from Brexit, but these are the most important and completely depend on TOTAL freedom from EU regulation. This is what is meant by Sovereignty. It has nothing to do with immigration.
What are these benefits? None of the major British industries, or their Associations such as the CBI have been able to see any benefits in Brexit. Small export businesses are facing complete ruin. Why are German and French industries able to prosper, and sell far more products to the new economies such as China, and yet still operate under EU rules?
If the UK as an industrial and services nation wants to sell to the EU, it will have to work under EU rules, which for the last 47 years, the UK has been instrumental in forming and regulating. Selling to the US involves handing regulatory control over to the US, with disputes settled by US trade tribunals composed entirely of US-industry nominated adjudicators. Under US trade rules, if a US company feels that it has been unfairly treated by the UK, it can sue the UK government and the UK competitors.
Total freedom to make one's own rules is a meaningless concept if nobody else agrees to it, and if the far bigger countries and blocs have the economic power to shut out any country that does not adhere to their rules.
These are issues freely discussed before the referendum and you should not project your own ignorance on to others.
What was discussed was two opposing views - one that said that the EU would roll over and give the UK everything that it wanted, and that countries would be queuing up to do deals (neither of which has happened) and the other which said that Brexit would cause enormous harm to the UK, both politically and economically, and which was dismissed and infantilised as Project Fear.
Biden cannot be allowed to derail the Brexit negotiations, even if it means sacrificing a deal with the US.
Biden's interest in the Brexit negotiations is based not only on trade, but also on the political investment that the US Democrats made in the Good Friday Agreement. Democratic Senator George Mitchell was the driving force behind getting all parties on the island of Ireland around the table and the US is the guarantor for the GFA.
Biden's opinion of Johnson, Gove and the UK government is of great importance for US-UK relationships. It is Johnson who is seen as a British version of Trump, wedded to broadly the same policies. Gove was the first British politician to meet Trump after Trump became President. It is Johnson who championed the Brexit legislation through Parliament, Johnson who signed the Withdrawal Agreement, and Johnson who now wants to tear up his own Great Deal and in doing so break international law.